CVE-2026-92525 Linux CVE debrief

Who should care

System administrators and security teams responsible for Linux kernel-based systems should assess their exposure and take steps to mitigate the vulnerability. This includes reviewing and updating Linux kernel versions, restricting access to the affected system, and monitoring system logs for suspicious activity.

Why it matters

CVE-2026-92525 is a Linux kernel vulnerability that allows a local unprivileged user to cause a denial-of-service (DoS) attack. The vulnerability is caused by a lack of validation of user-submitted Work Queue Entries (WQEs) in the `rxe_requester()` function. System administrators and security teams should assess their exposure and take steps to mitigate the vulnerability.

• Local unprivileged users can cause a denial-of-service (DoS) on the system
• The vulnerability can be exploited without authentication or elevated privileges
• Successful exploitation can lead to a system crash or instability
• Verification of kernel versions and patch application is necessary to mitigate the vulnerability

Technical summary

The Linux kernel is vulnerable to a local denial-of-service (DoS) attack due to a lack of validation of user-submitted Work Queue Entries (WQEs). An attacker can post a specially crafted WQE to a User Queue Pair (QP) to cause an out-of-bounds read in the `copy_data()` function. This occurs because the `num_sge` and `cur_sge` fields are not checked, allowing an attacker to post a WQE with an out-of-range `cur_sge` or oversized `num_sge`, leading to an out-of-bounds read in `copy_data()`. The vulnerability can be mitigated by bounding `num_sge` to `qp->sq.max_sge` in `rxe_requester()` before use, similar to how `get_srq_wqe()` guards SRQ entries, and bounding `cur_sge` only when the WQE carries payload. The fix  

Defensive priority

High

Recommended defensive actions

• Review and update Linux kernel versions to ensure the patch is applied
• Restrict access to the affected system to authorized users only
• Monitor system logs for suspicious activity
• Consider implementing additional security controls, such as SELinux or AppArmor, to limit the impact of a potential exploit
• Perform a thorough review of system configurations and user access controls
• Implement asset inventory management to track affected systems
• Establish a process for tracking and addressing exceptions

Evidence notes

The CVE record and associated sources indicate that the Linux kernel is vulnerable to a local DoS attack. The issue is caused by the lack of validation of user-submitted WQEs in the `rxe_requester()` function. The `num_sge` and `cur_sge` fields are not checked, allowing an attacker to post a WQE with an out-of-range `cur_sge` or oversized `num_sge`, leading to an out-of-bounds read in `copy_data()`.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.